PR fortran/23815: Add byte-swapping to gfortran

[Andreas Schwab]

Thomas Koenig <Thomas.Koenig@online.de> writes:

> Would you get the m68k extended float format by byte-reversing i386
> 80-bit reals?

No.  Even if you get the byte mapping right there are still differences in
how the format is interpreted, especially when dealing with denormals.

> What are the alignment restrictions on m68k extended floats, and
> what's the sizeof() of this type?

The size is 12.  It has a 16 bit sign+exponent, followed by a 16 bit gap,
followed by the 64bit mantissa, everything big endian, of course.  There
are no architectural alignment restrictions.

Andreas.

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Andreas Schwab, SuSE Labs, schwab@suse.de
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